1. Evidence or documentation that conclusively establishes the truth or validity of something, leaving no doubt or room for further dispute
The DNA test provided definitive proof of his innocence.
O teste de DNA forneceu prova definitiva de sua inocência.
2. Final or binding evidence in a legal or scientific context that settles a matter
The video footage was the definitive proof needed to convict the suspect.
O vídeo foi a prova definitiva necessária para condenar o suspeito.